Advanced base station technology

The authors present an overview of advances in three areas including software radio, adaptive antenna technology, and high-temperature superconductivity as currently envisioned for use in advanced cellular base stations. The conclusion broadly drawn is that the advancement in DSP and ASIC technologies will provide the major contribution in making these technologies technically and commercially realistic     

传统基站到有源天线基站的演进

随着无线网络的发展,基站架构也不断演进。详细介绍了传统基站、分布式基站、有源天线基站的架构,对比了其优缺点,说明了演进到有源天线基站的必然性。针对有源天线,明晰其概念,给出了设计思路,探讨了其技术优势。有源天线可通过波束成形覆盖更多小区,完全可满足未来低能耗、低成本绿色移动通信系统的发展要求,将成为基站演进的必然趋势。     

基站建设及基站天线的设计与分析

移动基站建设是为人们提供良好通信基础的重要途径,在移动基站建设过程中必须要选择合适的位置,提高基站的维修和运行成本,同时提高运行可靠性和稳定性。文章对通信基站建设以及基站的天线分布进行设计,旨在提高基站的工作效率。     

毫微微蜂窝基站的自配置功率机制

为了解决分层网络中由于添加飞小区引起的一系列干扰问题,提出了一种飞小区基站的自配置功率机制。该机制首先分析了飞基站可能受到各种其他基站的干扰和引起对已有用户的干扰类型,然后设计了一个功率最优化问题,即在保证已有用户正常通信前提下最大化飞小区的系统容量,最后通过拉格朗日乘数法得到了功率自配置的最优解。仿真结果表明该机制对比于基于接收信号强度设置功率机制,有效降低了飞基站发射功率,提高了已有用户的吞吐量,减少了对已有用户的干扰。     

GSM系统基站安装测试

本文简介了ＧＳＭ系统的基站构成和工作原理以及基站的安装测试，包括：平均载波功率、相位和频率误差、功率与时间关系、输出ＲＦ频谱、互调抑制、杂散幅射和合路器测试。     

Advanced EHF technologies for lightweight augmentationcommunication satellites

Small EHF satellites can significantly complement the antijam service provided by basic EHF MILSATCOM space segments. Mobile/survivable launch vehicles with rapid launch preparations can be utilised to deploy responsively these small satellites into high-altitude elliptical or circular orbits. From such orbits, only a few satellites are needed to provide high-duty-cycle coverage of a critical area. The communications capabilities provided by these EHF payloads can range from low-data-rate services (75 to 2400 bit/s per channel) to high-data-rate links (10 Mbit/s or more per link) depending on the payload configuration. Through the use of EHF waveform standards, these augmentation satellites will be compatible with existing and planned EHF terminals. Some of the key payload technologies include adaptive uplink antennas; high-speed, low-power digital signal-processing subsystems; lightweight frequency-hopping synthesisers; and efficient solid-state transmitters     

Parallel Channels for High Rate UTRAN

The method proposed in this paper uses space–time filtering to support parallel channel transmission as an effort to solve two main limitations facing UMTS Terrestrial Radio Access Network (UTRAN): throughput limitation and capacity limitation at high bit rates. The overall system capacity in the case of a spreading factor of 4 was enhanced by adding four channels, leading to a total physical layer throughput of 6.5 Mbps with a slight reduction in the performance of less than 1 dB for some users, while other users performance remain without any degradation. In another case where a spreading factor 8 was used adding four parallel channels leads to a total throughput of 5.1 Mbps with only 1.5 dB reduction in the performance of some users. Finally in the case of a spreading factor of 16, with a reduction of less than 3 dB in performance, an addition of eight parallel channels leads to a throughput of about 5 Mbps.     

Advanced technologies for optimized sub-quarter-micrometer SOI CMOSdevices

Two manufacturable technologies of fully-depleted (FD) thin-film silicon-on-insulator (SOI) MOSFET's for low-power applications are proposed in this paper. To maintain high current drive while aggressively thinning down the SOI film, silicide is to be formed on Ge-damaged silicon layers. Ge preamorphization facilitates silicide formation at low temperature (~450°C) and effectively controls the silicide depth without void formation. It also reduces the floating body effect. In addition, a reliable gate work-function engineering is introduced for good threshold voltage management. A p⁺SiGe/Si stack gate alleviates the threshold voltage instability of SOI due to film thickness nonuniformity and broadens the design window for channel doping. These advanced technologies, compatible with existing bulk CMOS technology, are integrated into SOI CMOS process. Excellent electrical device results are presented     

Predictive channel scheduling algorithm between macro base station and micro base station group

A novel predictive channel scheduling algorithm was proposed for non-real-time traffic transmission between macro-base stations and micro-base stations in 5G ultra-cellular networks.First,based on the stochastic stationary process characteristics of wireless channels between stationary communication agents,a discrete channel state probability space was established for the scheduling process from the perspective of classical probability theory,and the event domain was segmented.Then,the efficient scheduling of multi-user,multi-non-real-time services was realized by probability numerical calculation of each event domain.The theoretical analysis and simulation results show that the algorithm has low computational complexity.Compared with other classical scheduling algorithms,the new algorithm can optimize traffic transmission in a longer time dimension,approximate the maximum signal-to-noise ratio algorithm in throughput performance,and increase system throughput by about 14% under heavy load.At the same time,the new algorithm is accurate.Quantitative computation achieves a self-adaption match between the expected traffic rate and the actual scheduling rate.     

移动通信基站选址研究

阐述了移动通信基站选址的思路、原则以及建站过程中对防雷接地、电磁环境保护等方面的要求。认为在无线网络的规划中,基站站点的选取对网络的性能和运维影响很大,正确、合理地选择站址是无线网络规划关键步骤之一,在网络建设中起着相当重要的作用。     

Beamforming-type base station power control for personalcommunication networks

A new beamforming-type power control approach, at the base station of a personal communication network, is proposed. This approach provides an increased system capacity by performing a versatile form of spatial filtering which enhances the spectrum utilisation efficiency     

Advanced digital receiver principles and technologies for PCS

The synergy between digital radio communications and VLSI signal processing is revolutionizing the design of wireless terminals. Driving this synergy are certain fundamental paradigms in modern communication theory, digital signal processing, and VLSI design. The authors discuss the modern centers-of-gravity model, which they believe is emerging as the basis for the successful design and implementation of advanced digital communication systems. Central to this model are design principles that enable engineers to systematically derive digital receiver structures and explore algorithm and architecture trade-offs using sophisticated tools. Digital signal processing technology is critical in the implementation of these digital receiver structures efficiently. Finally, CAD tools for digital communications system design and design space exploration are shown to be of crucial importance in the efficient execution of these designs     

中兴通讯UTRAN传输解决方案

无线接入网部分的传输网建设是3G网络建设的重要组成部分.结合WCDMA网络特点,给出了适合建设无线接入网传输网的各种解决方案,包括SDH技术、MSTP技术、ATM交换机,以及利用基站级联组网等.最后给出了适应WCDMA网络演进的传输解决方案.     

Efficient models for base station antennas for human exposure assessment

Two simple and accurate models for base-station (BS) panel antennas are proposed for human-exposure assessment. Panel antennas comprise an antenna array with low coupling between its unit cells. The proposed model is based on the superposition of shifted radiating field contributions in amplitude and phase of a unit cell of the panel antenna. In the first model, the electric field is obtained via a full wave analysis of the antenna unit cell. In the second model, a far-field approximation of the unit cell is utilized, and is valid at about two wavelengths away from the antenna. It is shown that the second model can be used as an interactive tool for the verification of compliance to exposure limits of BS panel antennas as required by standards.     

支持未来全频谱接入通信的基站天线研究综述

随着移动通信系统的快速更新迭代,使用的频段也越来越丰富,支持全频谱接入通信成为未来基站天线的发展趋势.而日趋紧张的站址资源对未来基站天线的小型化水平提出了更高的要求.文章首先介绍了当前多频段基站天线的研究进展和成果,概括了并排式、交错式、堆叠式和嵌套式四种多频段结构类型,着重分析了异频耦合的产生原理和抑制方法;然后总结出共口径技术和异频解耦技术是未来全频谱基站天线的关键技术;最后阐述了当前共口径技术和异频解耦技术存在的局限性,展望了未来全频谱基站天线的研究方向,包括多种共口径方式组合技术、宽带异频解耦技术和大规模共口径天线阵列解耦技术.     

基站环评验收关键参数设置标准

环保部门对移动基站的验收标准和要求越来越高,不通过环评验收的基站将不予建设.环评验收中对基站的关键参数设置将至关重要,主要是发射功率及俯角.本文重点就如何设置发射功率及俯角进行了深入研究,得到了适用于工程实际的设置标准.     

基于SIM900A的基站无线监控系统

为了降低基站的日常运营管理成本,提高基站运营管理效率,实现对基站内关键设备的实时监控与维护,设计了一款基于SIM900A的基站无线监控系统。该系统采用AT89S52单片机和SIM900A模块进行无线数据传输,并对基站内的空调设备进行了实时的监控实验,取得了理想的测试效果。该系统具有运行稳定、抗干扰能力强、安装方便、成本低廉等优点,具有一定的实用价值和广阔的市场前景。